Oral Cavity

Question 1

innervation of tongue

Answer 1

1) lingual= somatic sensation, chorda tympani with taste
* *pre-syn para that are destined for SL and SM glands
2) CN9= taste and somatic sensation from post 1/3
3) CN12= post-syn para, innervates most intrinsic muscles, submandibular triangle

Question 2

sublingual artery of tongue anastomoses with?

Answer 2

submental branch off of facial artery

Question 3

Lingual artery

Answer 3

• Off of ECA
• Bulk of BS to tongue
• Gives off deep lingual, sublingual, dorsal lingual branches

Question 4

Dorsal lingual artery

Answer 4

• branches posteriorly off lingual

- posterior tongue, palatoglossus, palatine tonsils, epiglottis

Question 5

Sublingual artery

Answer 5

sublingual glands, floor of oral cavity (genioglossus)

Question 6

what is found within fimbriated fold?

Answer 6

deep lingual artery and vein

lingual nerve

Question 7

sublingual fold verses sublingual papilla

Answer 7

• sublingual fold= multiple ducts opening along fold to empty sublingual gland (MANY OPENINGS FOR SL)
• sublingual papillae= drain subMANDIBULAR gland at tip of sublingual fold (ONE OPENING for SM)

Question 8

Oral vestibule

Answer 8

lips and buccal mucosal to teeth (small)

*Buccinator muscle help prevent food from entering the vestibule

Question 9

oral cavity proper

Answer 9

teeth, hard/soft palate, tongue

Question 10

Pharynx subdivisions

Answer 10

1. Nasopharynx
2. Oropharynx
3. laryngopharynx

Question 11

ankyloglossia aka frecnectomy

Answer 11

-“tongue tied’ or ‘fused tongue’
o Most commonly a problem with the lingual frenulum/tongue (probs with breatfeeding and speech)
-test if tongue goes past incisors

Question 12

Blood supply to lips and cheeks

Answer 12

o Labial branch of facial artery
o Infraorbital artery
o Mental artery
o Buccal artery

Question 13

Innervation to lips and cheeks

Answer 13

o Infraorbital nerve
o Mental nerve
o Long buccal nerve

Question 14

Torus palatinus

Answer 14

o When hard palate fuses but is not smooth
o No treatment necessary
o 30% of population have it; more common in females

Question 15

Palatine aponeurosis

Answer 15

Where all the tendinous bellies of muscles of soft palate connect to hard palate

Question 16

Describe deglutition (swallowing)

Answer 16

1) Bolus held on hard palate; soft palate and posterior tongue create seal
2) Propulsion: apex of tongue rises and posterior tongue lowers to break seal; tongue moves up to squeeze food back
3) Pharyngeal stage: soft palate elevates, walls contract to close nasopharynx. Pharyngeal constrictor muscles contract top to bottom, epiglottis tilts back over laryngeal opening

Question 17

Sulcus terminalis

Answer 17

o Forms a V shape

o Separates lingual tonsils from rest of tongue

Question 18

What transitions between pharyngeal part and oral part of tongue?

Answer 18

o Circomvali taste buds mark transition

o Bulk of pharyngeal tongue is lingual tonsils

Question 19

Ectopic thyroid

Answer 19

o Thyroid originates as part of 1st pharyngeal pouch and descends to the laryngeal cartilages
o May remain connected to foramen cecum by thyroglossal duct
o Susceptible to cysts
o Typically ends up on laryngeal cartilage but if ectopic, normally found with lingual tonsils
—Pyramidal lobe is thyroid that didn’t descend all the way

Question 20

thyroglossal duct

Answer 20

connects between foramen cecum and thryroid if it doesn’t atrophy in childhood

Question 21

CN12 palsy

Answer 21

o Lesion to hypoglossal nerve (CN12)
o Rare, typically side affect of surgery
o Tongue will deviate towards paralyzed side
—Left CN12 is injured so apex of tongue curls to weakened left side